Fix router_picked_poor_directory_log() before 0.2.8 release
Users and developers still report log messages like this:
router_picked_poor_directory_log(): Bug: Firewall denied all OR and Dir addresses for all relays when searching for a directory. (on Tor 0.2.8.1-alpha-dev 9093e3769746742f)
After #18616 (moved) is fixed, we need to work out whether these logs still occur, and whether they are genuine bugs that affect reachability, or spurious warnings that should be eliminated.